Etymology From Middle English malt, from Old English mealt, from Proto-West Germanic *malt, from Proto-Germanic *maltą (“malt”), from *maltaz (“soft; nesh; weak; squashy; melting”), from Proto-Indo-European *meld-, *mled- (“to crush; grind; make weak”). Cognate with Saterland Frisian Moalt (“malt”), Dutch mout (“malt”), German Malz (“malt”), Swedish malt (“malt”), Old Church Slavonic младъ (mladŭ, “tender; young”), Russian молодой (molodoj, “young; fresh; new”). The Proto-Germanic noun was borrowed into Proto-Slavic as *malta; compare Ukrainian мо́лот (mólot), Czech mláto. More at melt.
1
Malted grain (sprouted grain) (usually barley), used in brewing and otherwise.
2
Malt liquor, especially malt whisky.
Oh many a peer of England brews Livelier liquor than the Muse, And malt does more than Milton can To justify God's ways to man.1896, A. E. Housman, A Shropshire Lad, section LXII:
3
US, Informal A milkshake with malted milk powder added for flavor.
Afterward she sat in the drugstore sucking malt through a straw.1992, Toni Morrison, Jazz, Vintage (2016), page 89:
Etymology From Middle English malt, from Old English mealt, from Proto-West Germanic *malt, from Proto-Germanic *maltą (“malt”), from *maltaz (“soft; nesh; weak; squashy; melting”), from Proto-Indo-European *meld-, *mled- (“to crush; grind; make weak”). Cognate with Saterland Frisian Moalt (“malt”), Dutch mout (“malt”), German Malz (“malt”), Swedish malt (“malt”), Old Church Slavonic младъ (mladŭ, “tender; young”), Russian молодой (molodoj, “young; fresh; new”). The Proto-Germanic noun was borrowed into Proto-Slavic as *malta; compare Ukrainian мо́лот (mólot), Czech mláto. More at melt.
1
To convert a cereal grain into malt by causing it to sprout (by soaking in water) and then halting germination (by drying with hot air) in order to develop enzymes that can break down starches and proteins in the grain.